London: Post 2030, India is expected to become the world’s third largest economy, just behind China and US, according to a research report by the UK-based Centre for Economics Business and Research (CEBR). China is expected to surpass the US as the world's largest economy in 2029 with the US slipping to second place and India close behind at third. In 2030, China's projected Gross Domestic Product (GDP) will be US$ 34,338 billion followed by America's US$ 32,996 billion and India’s US$ 10,133 billion. India will also become the largest economy in the Commonwealth after it overtakes the British economy in 2019. The report also says that India is expected to overtake China in the second half of the century. Britain will move up to take fourth spot and Brazil will take the fifth to complete the top five. Brazil and India are also expected to be included in the exclusive G8 club of developed democracies, once they meet the political criteria for its membership. Over the next 15 years, UK is set to become the best performing economy in the western world.